Conversion formula

The conversion factor from cups to cubic feet is 0.0083550347222188, which means that 1 cup is equal to 0.0083550347222188 cubic feet:

1 cup = 0.0083550347222188 ft3

To convert 81 cups into cubic feet we have to multiply 81 by the conversion factor in order to get the volume amount from cups to cubic feet. We can also form a simple proportion to calculate the result:

1 cup → 0.0083550347222188 ft3

81 cup → V_(ft3)

Solve the above proportion to obtain the volume V in cubic feet:

V_(ft3) = 81 cup × 0.0083550347222188 ft3

V_(ft3) = 0.67675781249972 ft3

The final result is:

81 cup → 0.67675781249972 ft3

We conclude that 81 cups is equivalent to 0.67675781249972 cubic feet:

81 cups = 0.67675781249972 cubic feet

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 cubic foot is equal to 1.4776334776341 × 81 cups.

Another way is saying that 81 cups is equal to 1 ÷ 1.4776334776341 cubic feet.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that eighty-one cups is approximately zero point six seven seven cubic feet:

81 cup ≅ 0.677 ft3

An alternative is also that one cubic foot is approximately one point four seven eight times eighty-one cups.

Conversion table

cups to cubic feet chart

For quick reference purposes, below is the conversion table you can use to convert from cups to cubic feet